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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Urinary Tract Infection II: Pathophysiology01:25

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Antimicrobial Proteins01:23

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Factors Affecting the Risk of Infection01:26

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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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Complement System01:27

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Design of Cecal Ligation and Puncture and Intranasal Infection Dual Model of Sepsis-Induced Immunosuppression
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THE IMMUNOPATHOGENESIS OF POLYMICROBIAL SEPSIS.

Firas S Zetoune1, Peter A Ward

  • 1Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan.

Shock (Augusta, Ga.)
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Recent advances reveal the complement system

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Critical Care Medicine

Background:

  • The complement system, a crucial part of innate immunity, plays a significant role in host defense.
  • Dysregulation of complement activation is implicated in the pathogenesis of sepsis and other inflammatory conditions.
  • Understanding complement's role in sepsis has evolved significantly over the past 25 years.

Purpose of the Study:

  • To review recent advances in understanding complement activation pathways and products.
  • To explore the role of complement, particularly C5a and its receptors, in sepsis and COVID-19-related lung dysfunction.
  • To highlight therapeutic strategies targeting the complement system for sepsis and COVID-19.

Main Methods:

  • Literature review of studies published from the late 1990s to October 2022.
  • Analysis of research on complement activation pathways, anaphylatoxins (C5a), and their receptors (C5aR1, C5aR2).
  • Examination of data from human and murine sepsis models, and patients with COVID-19-induced lung dysfunction.

Main Results:

  • Significant progress has been made in elucidating complement activation pathways and products, including C5a.
  • Complement activation contributes to both pro-inflammatory responses causing organ dysfunction and immunosuppression in sepsis.
  • Research in sepsis and COVID-19 highlights the therapeutic potential of targeting the complement system.

Conclusions:

  • The complement system is a key player in the pathophysiology of sepsis and COVID-19-related lung injury.
  • Targeting complement activation pathways offers promising therapeutic avenues for critical illnesses.
  • The field is rapidly advancing, indicating a new era in complement-based therapies.